The main thing is that p100s tend to be elastomeric respirators, and those have a substantially better fit than traditional n95 respirators. I’m not going to go

The main thing is that p100s tend to be elastomeric respirators, and those have a substantially better fit than traditional n95 respirators. I’m not going to go digging for the study right now (should be easy to find) but even heathcare workers who had previously fit tested with an n95 only had a bit over 50% chance to get a good seal in a realistic scenario, and it was far worse for people who had not fit tested. Every person who used the elastomeric respirators got a good seal. Most people don’t do at home fit testing, and even if they do they aren’t testing in a real world situation where they are wearing the respirator for a long time, turning their heads, etc. Elastomerics are just enormously better in these situations.